feat: implement SyncAggregatorSelectionData container (#900)

Author: MegaRedHand

lib/types/beacon_chain/sync_aggregator_selection_data.ex

@@ -0,0 +1,24 @@
+defmodule Types.SyncAggregatorSelectionData do
+  @moduledoc """
+  Struct definition for `SyncAggregatorSelectionData`.
+  """
+  use LambdaEthereumConsensus.Container
+
+  fields = [:slot, :subcommittee_index]
+
+  @enforce_keys fields
+  defstruct fields
+
+  @type t :: %__MODULE__{
+          slot: Types.slot(),
+          subcommittee_index: Types.uint64()
+        }
+
+  @impl LambdaEthereumConsensus.Container
+  def schema do
+    [
+      slot: TypeAliases.slot(),
+      subcommittee_index: TypeAliases.uint64()
+    ]
+  end
+end

test/spec/runners/ssz_static.ex

@@ -15,6 +15,8 @@ defmodule SszStaticTestRunner do
   use ExUnit.CaseTemplate
   use TestRunner
 
+  @only_ssz_ex [Types.Eth1Block, Types.SyncAggregatorSelectionData]
+
   @disabled [
     # "DepositData",
     # "DepositMessage",
@@ -50,19 +52,18 @@ defmodule SszStaticTestRunner do
     # "BeaconBlockBody",
     # "BeaconState",
     # "SignedAggregateAndProof",
+    # "Eth1Block",
+    # "SyncAggregatorSelectionData",
     # -- not defined yet
     "LightClientBootstrap",
     "LightClientOptimisticUpdate",
     "LightClientUpdate",
-    # "Eth1Block",
+    "LightClientFinalityUpdate",
+    "LightClientHeader",
     "PowBlock",
     "SignedContributionAndProof",
-    "SignedData",
-    "SyncAggregatorSelectionData",
     "SyncCommitteeContribution",
     "ContributionAndProof",
-    "LightClientFinalityUpdate",
-    "LightClientHeader",
     "SyncCommitteeMessage"
   ]
 
@@ -120,7 +121,7 @@ defmodule SszStaticTestRunner do
     {:ok, serialized_by_ssz_ex} = SszEx.encode(real_deserialized, schema)
     assert serialized_by_ssz_ex == real_serialized
 
-    if schema not in [Types.Eth1Block] do
+    if schema not in @only_ssz_ex do
       {:ok, deserialized_by_nif} = Ssz.from_ssz(real_serialized, schema)
       assert Diff.diff(deserialized_by_ssz_ex, deserialized_by_nif) == :unchanged